基于RLWE的密文策略属性代理重加密

RLWE-based ciphertext-policy attribute proxy re-encryption

针对现有基于LWE的代理重加密方案存在无法实现细粒度访问及效率低的问题,结合线性秘密共享方案、RLWE和属性加密,提出一种密文策略属性代理重加密方案。该方案可以缩短密钥尺寸、减小密文空间、提高加解密效率,同时利用线性秘密共享矩阵作为访问矩阵,满足授权人细粒度委托控制的需求,抵抗代理服务器和被授权人之间的合谋。安全分析表明,在基于RLWE假设的标准模型下,所提方案是安全的。

To solve LWE-based proxy re-encryption schemes cannot achieve fine-grained access and low efficiency problem, a ciphertext-policy attribute-based proxy re-encryption scheme was proposed. The scheme based on linear se-cret sharing scheme, RLWE and attribute encryption could shorten the key size, reduce the ciphertext space and improve the efficiency of encryption and decryption. At the same time, the linear secret sharing matrix was used as an access ma-trix to meet the requirements of authorized person fine-grained commissioning control and to resist the collusion between the agent and the authorized person. In addition, the proposed scheme is shown to be secure under the ring learning with errors assumption in the standard model.